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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings.bluetooth;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceCategory;
import android.preference.PreferenceGroup;
import android.preference.PreferenceScreen;
import android.util.Log;
import com.android.settings.RestrictedSettingsFragment;
import com.android.settingslib.bluetooth.BluetoothCallback;
import com.android.settingslib.bluetooth.BluetoothDeviceFilter;
import com.android.settingslib.bluetooth.CachedBluetoothDevice;
import com.android.settingslib.bluetooth.LocalBluetoothAdapter;
import com.android.settingslib.bluetooth.LocalBluetoothManager;
import java.util.Collection;
import java.util.WeakHashMap;
/**
* Parent class for settings fragments that contain a list of Bluetooth
* devices.
*
* @see BluetoothSettings
* @see DevicePickerFragment
*/
public abstract class DeviceListPreferenceFragment extends
RestrictedSettingsFragment implements BluetoothCallback {
private static final String TAG = "DeviceListPreferenceFragment";
private static final String KEY_BT_DEVICE_LIST = "bt_device_list";
private static final String KEY_BT_SCAN = "bt_scan";
private BluetoothDeviceFilter.Filter mFilter;
BluetoothDevice mSelectedDevice;
LocalBluetoothAdapter mLocalAdapter;
LocalBluetoothManager mLocalManager;
private PreferenceGroup mDeviceListGroup;
final WeakHashMap<CachedBluetoothDevice, BluetoothDevicePreference> mDevicePreferenceMap =
new WeakHashMap<CachedBluetoothDevice, BluetoothDevicePreference>();
DeviceListPreferenceFragment(String restrictedKey) {
super(restrictedKey);
mFilter = BluetoothDeviceFilter.ALL_FILTER;
}
final void setFilter(BluetoothDeviceFilter.Filter filter) {
mFilter = filter;
}
final void setFilter(int filterType) {
mFilter = BluetoothDeviceFilter.getFilter(filterType);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mLocalManager = Utils.getLocalBtManager(getActivity());
if (mLocalManager == null) {
Log.e(TAG, "Bluetooth is not supported on this device");
return;
}
mLocalAdapter = mLocalManager.getBluetoothAdapter();
addPreferencesForActivity();
mDeviceListGroup = (PreferenceCategory) findPreference(KEY_BT_DEVICE_LIST);
}
void setDeviceListGroup(PreferenceGroup preferenceGroup) {
mDeviceListGroup = preferenceGroup;
}
/** Add preferences from the subclass. */
abstract void addPreferencesForActivity();
@Override
public void onResume() {
super.onResume();
if (mLocalManager == null || isUiRestricted()) return;
mLocalManager.setForegroundActivity(getActivity());
mLocalManager.getEventManager().registerCallback(this);
updateProgressUi(mLocalAdapter.isDiscovering());
}
@Override
public void onPause() {
super.onPause();
if (mLocalManager == null || isUiRestricted()) {
return;
}
removeAllDevices();
mLocalManager.setForegroundActivity(null);
mLocalManager.getEventManager().unregisterCallback(this);
}
void removeAllDevices() {
mLocalAdapter.stopScanning();
mDevicePreferenceMap.clear();
mDeviceListGroup.removeAll();
}
void addCachedDevices() {
Collection<CachedBluetoothDevice> cachedDevices =
mLocalManager.getCachedDeviceManager().getCachedDevicesCopy();
for (CachedBluetoothDevice cachedDevice : cachedDevices) {
onDeviceAdded(cachedDevice);
}
}
@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen,
Preference preference) {
if (KEY_BT_SCAN.equals(preference.getKey())) {
mLocalAdapter.startScanning(true);
return true;
}
if (preference instanceof BluetoothDevicePreference) {
BluetoothDevicePreference btPreference = (BluetoothDevicePreference) preference;
CachedBluetoothDevice device = btPreference.getCachedDevice();
mSelectedDevice = device.getDevice();
onDevicePreferenceClick(btPreference);
return true;
}
return super.onPreferenceTreeClick(preferenceScreen, preference);
}
void onDevicePreferenceClick(BluetoothDevicePreference btPreference) {
btPreference.onClicked();
}
public void onDeviceAdded(CachedBluetoothDevice cachedDevice) {
if (mDevicePreferenceMap.get(cachedDevice) != null) {
return;
}
// Prevent updates while the list shows one of the state messages
if (mLocalAdapter.getBluetoothState() != BluetoothAdapter.STATE_ON) return;
if (mFilter.matches(cachedDevice.getDevice())) {
createDevicePreference(cachedDevice);
}
}
void createDevicePreference(CachedBluetoothDevice cachedDevice) {
if (mDeviceListGroup == null) {
Log.w(TAG, "Trying to create a device preference before the list group/category "
+ "exists!");
return;
}
BluetoothDevicePreference preference = new BluetoothDevicePreference(
getActivity(), cachedDevice);
initDevicePreference(preference);
mDeviceListGroup.addPreference(preference);
mDevicePreferenceMap.put(cachedDevice, preference);
}
/**
* Overridden in {@link BluetoothSettings} to add a listener.
* @param preference the newly added preference
*/
void initDevicePreference(BluetoothDevicePreference preference) {
// Does nothing by default
}
public void onDeviceDeleted(CachedBluetoothDevice cachedDevice) {
BluetoothDevicePreference preference = mDevicePreferenceMap.remove(cachedDevice);
if (preference != null) {
mDeviceListGroup.removePreference(preference);
}
}
public void onScanningStateChanged(boolean started) {
updateProgressUi(started);
}
private void updateProgressUi(boolean start) {
if (mDeviceListGroup instanceof BluetoothProgressCategory) {
((BluetoothProgressCategory) mDeviceListGroup).setProgress(start);
}
}
public void onBluetoothStateChanged(int bluetoothState) {
if (bluetoothState == BluetoothAdapter.STATE_OFF) {
updateProgressUi(false);
}
}
public void onConnectionStateChanged(CachedBluetoothDevice cachedDevice, int state) { }
}
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